Piston-rod extension.



No. 771,023. PATENTED SEPT. 27, 1904 I. D. MORGAN.

PISTON ROD EXTENSION.

. AYPLIOATION FILED MAR. s. 1904.

N0 MODEL. 2 SHEETS-SHEET 1.

No. 771,023. PATENTED SEPT. 27, 1904,

- I. D. MORGAN.

PISTON ROD EXTENSION.

v V APPLIUATION FILED MAR s, 1904. no MODEL. 2 SHEETS-SHEET 2.

Patented September 2'7, 1904.

PATENT OFFICE.

ISAAC D. MORGAN, OF ST. LOUIS, MISSOURI.

PISTON-ROD EXTENSION.

SPECIFICATION forming part of Letters Patent No. 771,023, datedSeptember 2'7, 1904.

-' Application filed March 8, 1904.

To all whom it may concern:

Be it known that I, ISAAC D. MORGAN, a citizen of the United States,residing at St. Louis, State of Missouri, have invented certain new anduseful Improvements in Piston-Rod EX- tensions, of which the followingis a specification containing a full, clear, and exact description,reference being had to the accompanying drawings, forming a part hereof.

My invention relates to piston-rod extensions; and it consists of thenovel construction hereinafter described and claimed.

The object of my invention is to provide an improved mechanism wherebythe stroke of piston-rods or the throw of cranks may be increased ordiminished, as may be required by the nature of the service.

In the drawings, Figure-1 is a side elevation of a steam-engine havingmy invention applied thereto. Fig. 2 is a plan view of the same. Fig. 3is a detail perspective View of a forked bar made use of in carrying outmy invention. Fig. 4 is a detail view in perspective of a curved barmade use of in carrying out my invention. Fig. 5 is a detail perspectiveview of one of the central bars of the lazy-tongs construction.

1 indicates the base of a common steam-engine having the usual cylinder2, piston-rod 3, fly-wheel 4, crank-pin 5, connecting-rod 6, cross-head7, and guides 8.

Although in the present instance I have shown a steam-engine having myinvention applied thereto, yet it will be readily understood that theconstruction hereinafter described may as well be applied to hydraulicelevator piston-rods, air-compressor pistonrods, or, in fact, any commonconstruction in which a piston-rod or a crank are now used. The onlyessentials are a piston-rod, a crank, a connecting-rod, and a lazy-tongsconnection between the connecting-rod and piston-rod, or if motion is tobe communicated from a crank to a piston-rod, as in a commonair-compressor, then the construction may not be changed in anyparticular from that shown herein; but if motion is to be communicatedfrom the pistonrod to a cross-head carrying a number of ropesheaves, asin a hydraulic elevator, then the connecting-rod and crank of coursewill be dispensed with, or if it be desired to reduce Serial No.197,195. (No model.)

the stroke of a long crank and communicate its motion to a shortercrank, or vice versa, then the cylinder 2 will of course be dispensedwith, as will also the piston-rod 3, and another connecting-rod, such as6, will be connected to the lazy-tongs at one end and to a second crankat its opposite end.

Mounted in laterally alined bearings 9, which in the present instanceare formed integral with the guides 8 and are located one upon each sideof the pistonrod 3, are the journals 10 of a forked bar 11. Saidjournals 10 project in alinement from the outer sides of the forks ofsaid forked bar near the free ends thereof, and projecting from theopposite end of said forked bar is a bolt 12, which is provided with acommon nut at each end and which bolt connects said forked bar to oneend of the lazy-tongs, which is composed of the usual number of crossedlevers 13.14, depending, of course, upon the stroke which is to beimparted to the crank in accordance with the well-known principle thatthe longer the stroke the greater the number of pairs of crossed leversmust be employed. 15 15 indicate two curved bars, the upper ends ofwhich are pivotally mounted upon the journals 10 of said forked bar nextto the bearings 9 and the lower ends of which are pivotally connected,by means of another bolt 12, to the lower end of the adjacent crossedlever 14. The outer end of the piston-rod 3 is connected to anothercross-head 3, and the latter is connected to the lazy-tongs by means ofanother bolt 12, which passes through said cross-head and through thecrossed levers 13 14 at their crossing-point. The opposite end of thelazy-tongs is pivotally connected to the cross-head 7 by means of a bolt16. In this connection I desire to state that the bolts 12 of the forkedbar 11 and of the crossed levers 14 are fixed rigidly within said forkedbar and said levers, so that they act as gudgeons .and prevent any wearfrom taking place within said forked bar and levers.

One of the principal advantages of my invention is that it converts thelazy-tongs into what I call an extension-lever, which latter exerts itsforce in a direct central line from the piston-rod to the crank-pin.

I claim- 1. A stroke increasing or diminishing device, the samecomprising a suitable base, guides on said base, a cross-head for saidguides, laterally-alined bearings carried by.

said base, a forked bar having journals at its forked end mounted Withinsaid bearings, a pair of curved bars pivotally mounted at one end uponsaid journals and having their opposite ends connected to one member ofthe lazy-tongs, a lazy .tongs the corresponding member of which isconnected to the end of said forked bar which is opposite its forkedend, the opposite end of said lazy-tongs being connected to saidcross-head, a powertransrnitting bar also connected to said crosshead,and a power-transmitting rod connected to the pair of crossed leverswhich are farthest from said cross-head, substantially as described.

2. A stroke increasing or diminishing device, the same comprising asuitable base, guides on said base, a cross-head, laterallyalinedbearings, a forked bar having journals at its forked end mounted withinsaid bearings, a pair of curved bars pivotally mounted at one end uponsaid journals and having their opposite ends connected to one member ofthe lazy-tongs, a lazy-tongs, one member of which is connected to saidforked bar, the 3

